Fuse link with striker VVT-D3 24kV/125A 537 004252518

Reliable medium voltage protection

VVT-D3 24kV/125A 537 fuse link is a component designed to protect medium voltage (MV) electrical and power equipment against the effects of short circuits and overloads. It is used to protect conductors, cables, transformers, motors, and capacitor banks. Its construction based on proven technology ensures reliable operation in demanding working conditions.

Construction and operating principle

This fuse link, equipped with a thermal trigger, reacts not only to short-circuit current but also to a rise in body temperature to approx. 120°C – regardless of the source of heat. This is particularly important in applications where short-term overloads should not cause a shutdown, but protection against overheating is crucial. Activation of the trigger activates a striker with a force of 80N, signaling intervention and enabling the operation of the fuse disconnector mechanism. After activation, the striker extends by approximately 30mm.

Key features and benefits

• High short-circuit breaking capacity: 63 kA – ensures effective protection of the installation even with high short-circuit currents.
• Thermal trigger: protects against the effects of long-term overload and overheating, increasing system safety and reliability.
• Intervention indication: 80N striker informs about the intervention of the fuse link, facilitating fault location and removal.
• Solid construction: high-strength ceramic tube and galvanically protected contacts ensure long life and resistance to environmental conditions.
• Reliable sealing system: protects against moisture, which is crucial in installations exposed to humidity.
• Silver element: guarantees precise operation and repeatability of parameters.
• Compliance with standards: the product has passed type tests at KEMA Labs, confirming its quality and safety.

Applications

VVT-D3 fuse links are widely used in:

• Medium voltage switchgear
• Transformer stations
• Protection of electric motors
• Protection of cable and overhead lines
• Industrial and power installations

Technical parameters (for information)

• Type of voltage: AC
• Rated current: 125 A
• Rated voltage: 10/24 kV
• Rated frequency: 50/60 Hz
• Cold resistance: 11.9 mΩ
• Power loss: 317 W
• Pre-arcing integral (I²t min): 49000 A²s
• Breaking integral (I²t max): 220000 A²s
• Diameter: 83.5 mm
• Length: 537 mm
• Weight: 7 kg